Valve attachment for pneumatic tires



VALVE ATTACHMENT FOR PNEUMATIC TIRES.

APPucATIoN HLED'AUG17. 1921.

Patented Sept. 26, 1923,

Patented Septo Z6, i922.,

NTE@ FTF@ wenn naar eri-wea;`

.arman .rutas MICHELIN, or chaumont-rename, ramen.

vanvn a'rzraomann'rror. annemarie Trans.

Application filed August 17, 1 921.4 Serial No. 493,077.

following to be a full, clear, and'` exact' de- Dil scription of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

y present invention relates to improvements in the construction of valve attachments for pneumatic tires. The present practice in using such valves is to provide a plastic joint between the valve and its seat, for instance an annular plug of rubber or other yielding material is used, which engages with the coned valve seat and forms a yielding joint which is likely to wear out, or deteriorate, or leak. Accordin to my present invention ll combine wlth such a joint a second all metal joint which may be used indefinitely Without materially wearing or depreciating, or becoming injured in any way.-

y invention will be more fully under.- stood after reference to the accompanying drawings, in which like parts are indicated by similar reference symbols throughout the several views, and in which Figure 1 is a central longitudinal section through' the valve casing and parts carried thereby, the valve stem and plastic valve being shown in elevation.

Figu 2--2 of Figure 1, and looking in the direction of the arrows; and

' Figure 3 shows a section along the line 3-3 of Figure 1, and looking in the direction of the arrows.

A represents a valve casing which is in the form of a hollow cylinder provided 'with the usual flanged end ai, `and with the usual screw threads a to receive the washer B, and .the nut C, which nut forces the washer 'B into the .position for making a tight joint with the inner tube D, shown in dotted lines in Figure l.

The valve casing A is shouldered, near its outer end, as at a?, and is provided with a screw-threaded reduced yportion a3. rFhe interior of the easing is reduced, as at a4, and provided with a shoulder' a0 to engage the cup E which 1s forced 1nto place and held by frictional engagement agalnst turnre 2 shows a section along the linev ingin the casing. This cup is provided with an elongated slot e in its bottom, through which passes the squared end f of the valve stem F, and thus the part f of the valve stem is free to slide through said slot but cannot turn therein.

The valve stem F carries the cone valve Gr which rests on the coned seat a, and the said valve may be covered with rubber or similar yielding material g so as to form a lastic` joint with its seat.

he valve stem F, beyond the valve G, is provided with two sets of screw threads and f2 connected by the reduced portion Gti f3 of the valve stem. These screw threads v are both in the same direction and engage the internal screw threads h of the metal valve H which is coned as at h and makes will draw the plastic valve G firmly on its' seat. Thus when we setup on the valve H, we at the same time tighten the valve G, and when we ease up on the valve H,

it is possible to push the valve stem inward and loosen the-valve G from its seat.

The squared end f of the valve stem F will prevent the said valve stem from turning as the valve H is -set up, and the turning of this valve H in the setting up oper! ation will tend'to keep the metal joint at ae groundY and hence tight.' ln order to prevent the valve H from being accidentally turned so far as to fall from the stem F, and possibly Ibe lost, l dent in the wall of said valve as at il? where it registers with the reduced portion f9- of the valve stem F. The consequence is that the valve H may be screwed backwards or forwards through the limited distance required, but when the distorted teeth la? engage either the threaded segments f or f2 of the valve stem F, the turning movement of the valve H is arrested, and it 1s thus permanently locked on the valve stem F after the parts are properly assembled.

As a final protection to the projecting end of the apparatus, a hollow screw cap l is provided to screw over the reduced end as of the valve casing A. Thus it will be seen that l provide a valve arrangement in which there is a double seal to prevent the escape ot air from the inner tube of the this douhle seal consisting iirst et the plastic valve G .on its seat, andilsecond of an all metal valve H engaging on a ine-v tallic seat, the two valves being oppositely disposed, and the setting up ot the outer valve tending to .draw the innervalve more rmly on its seat', and the releasing .or the outer valve permitting vthe longitudinal movement or the valve stem, as is required when reiilling the tube with compressed am,

lin order to assemble the parts of the valve attachment for use with Athe inner tube, the washerB is slipped over the outside or the casing, and the nut C screwed nearly home. rllhe valve stem carrying the valve H is inserted in the larger end ot the casing, and the cu E is forced down to the position shown 1n Figure l. rlFhe valve H is then screwed down until the partft2 clears the screw threads 'f2 l v ot the valve stem, and then the shell or the the inner tnh'e'in the nsualway, as is well known the' I- llt will he obvious that various modifications might he made in the hereindescribed apparatus, and in the construction, combination'and arrangement of Yparts `which could be used without departing fromthe spirit or my invention; and li do not mean to limit the invention to such details eX- cept as particularly pointed out` 1n the claim. v

ll claim:

lin a valve for pneumatic tires, the -cornbinationwith a hollow valve casing provided with a tapered valve seat therein, and a second valve seat at the outer end thereof, of a 4valve' Smm provided with a yielding conical Vvalve adapted to lit on said valve seat, said valve stem-being provided with an outwardly projecting end having screw' threads thereon separat/ed hy an annular groove, and a metal .valve provided with a thin tubular shank having internal screw threads and adapted to screw over said screw threads on the valve stem and to seat a ainst the outer taceof said casing, said s ank being dented inwards into said an-I nular groove, whereby Asaid shank and said metal valve are prevented from accidental removal :trom said valve stem, but are permitted limited longitudinal and rotary movement thereon, with means for holding said valve stem against turning in said valve casing as said metal valve is screwed into engagement.

Annianannns iminnaiv. 

